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参数资料
| 型号： | L9942XP1TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO24 |
| 封装： | ROHS COMPLIANT, SSOP-24 |
| 文件页数： | 28/40页 |
| 文件大小： | 639K |
| 代理商： | L9942XP1TR |
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Appendix
L9942
Doc ID 11778 Rev 6
bridge and current comparator has as new reference the overcurrent limit. A shortage to
ground can be detected, but not between the outputs.
Is it recommended to use the different fast decay modes too, especially in period if the load
current has to reduce from step to step. The duration of fast decay can set by fixed time ore
that it depends on the comparator signal utilizing the second current mirror at LS switch.
There can be monitored the undershoot of bridge current during OFF state.
Fast decay can be seen as switching the bridge in opposite direction, if it is compared to ON
state before. The load current control at HS switch is not used, but the comparator is still
active. The reference value is changed to overcurrent limit and a shortage to ground or now
between the outputs too will result in a signal. The internal filter time of at least 4 us will
inhibit the signal in many applications. Then you can use the mode “auto decay without any
delay time“ (On Section 5.1 mode 100). On page 12 you can find in the lower part of
Figure 3 the phase counter values, when fast decay as only part of mixed decay is used and
the shortages can be detected during a longer time. After this it is signalized in register 7 as
overcurrent in HS switch (e.g. in Figure 17 HSA1).
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